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Abstract

Purpose: Reduced peak aerobic capacity in chronic heart failure can be partly explained by impaired peripheral factors. However, skeletal muscle deoxygenation responses during exercise and their relation to peak aerobic capacity have not been fully established in early post-myocardial infarction (MI) patients.

Methods: Patients early post-MI (age, 61 ± 9 yr; n = 16; 21 ± 8 d after the first MI) and age-, height-, and weight-matched control participants (age, 61 ± 9 yr; n = 18) performed a ramp cycling exercise until exhaustion. Near-infrared spectroscopy at the belly of the vastus lateralis muscle in the left leg was recorded continuously for measurement of skeletal muscle deoxygenation responses during exercise.

Conclusions: Skeletal muscle deoxygenation abnormalities were observed during dynamic cycling exercise in early post-MI patients. These abnormalities were related to impaired peak aerobic capacity in early post-MI patients.

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